Mr Jamil said when Mrs Mariane Pearl called a few days later to inquire after her husband, he advised her to get her husband's mobile phone bill which would show who had called him twice while Mr Pearl was in Mr Jamil's office.

Mr Jamil added that Mrs Pearl later told him the number from which those two calls were made belonged to Imtiaz Siddiqe, one of seven other people the police are now looking for.

He said she told him this number had earlier been e-mailed to her husband by Mohammad Bashir, a name police say was at the time being used as an alias by Omar Sheikh himself.

Retracted statement

The court also heard from two Pakistani police officers, Athar Rashid and Faisal Noor, who had attended a hearing in February at which Omar Sheikh said he believed Mr Pearl was dead.

According to a defence attorney Khawaja Naveed, the two officers said Omar Sheikh had said he had masterminded Mr Pearl's abduction, that he would not defend himself and that Mr Pearl was dead.

However, Omar Sheikh did not make that statement under oath, later retracting it, and defence lawyers say it should not be admissible in the hearings at all.

The trial, held behind closed doors in a makeshift courtroom at Karachi Central Jail, is taking place amid massive security.

Omar Sheikh's father Saeed Sheikh, who has been allowed to attend the hearings, said he had met his son before the proceedings began, and that Omar Sheikh wished to pass on a message.

This was a warning that those who oppressed Muslims would have to face the "wrath of god".

The hearings resume on Wednesday when the prosecution says it will call another 10 witnesses.